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New Horizons: Pre-launch, launch and main cruise, Pluto and the Kuiper belt
ugordan
post Sep 12 2008, 03:16 PM
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QUOTE (Alan Stern @ Sep 12 2008, 05:12 PM) *
So now the simulator is laced up with diagnostic tools to catch the next one in the act so we can, hopefully, get to root cause.

Of course, as things often go, adding debugging information to an existing real-time system can change timing issues and even completely eliminate further occurences of a fault. Debugging is a tricky business. I understand how frustrating this must be for your team, I can only wish you happy hunting!


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Greg Hullender
post Sep 14 2008, 02:58 PM
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QUOTE (ugordan @ Sep 12 2008, 07:16 AM) *
Of course, as things often go, adding debugging information to an existing real-time system can change timing issues and even completely eliminate further occurences of a fault.

We used to call that a "Heisenbug." They're the worst.

--Greg
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tanjent
post Sep 15 2008, 11:11 AM
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I suppose this is egregiously off topic and even slightly political, but isn't it wonderful to call a bug a "bug" instead of an "issue"?
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Alan Stern
post Sep 15 2008, 11:38 AM
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The NH mission ops team is updating the spacecraft's onboard fault protection/correction Autonomy software today/tomorrow with about 40 improvements. This is step two of the flight software redux. Last week was C&DH. After Autonomy this week, will be Guidance & Control software (G&C) next week to complete the comprehensive set of bug fixes and capability upgrades we've been working on for 18 months.

-Alan
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Stu
post Sep 15 2008, 11:41 AM
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Uh oh, I got a bad feeling about this... innocently updating systems, upgrading capabilities... this is how Skynet started out... ohmy.gif tongue.gif


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Alan Stern
post Sep 15 2008, 12:49 PM
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QUOTE (Stu @ Sep 15 2008, 12:41 PM) *
Uh oh, I got a bad feeling about this... innocently updating systems, upgrading capabilities... this is how Skynet started out... ohmy.gif tongue.gif


Skynet--

Well, we don't *innocently* do anything on NH, and all three of these flight software packages have previously been updated in flight.

Of course, Murphy Always Lurks, which of course as an acronym spells the first three letters in MALfunction so we test the hell out of this stuff on the spacecraft ground simulator.

-Alan
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Vultur
post Sep 15 2008, 05:08 PM
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QUOTE (Stu @ Sep 15 2008, 11:41 AM) *
Uh oh, I got a bad feeling about this... innocently updating systems, upgrading capabilities... this is how Skynet started out... ohmy.gif tongue.gif


Well, at least NH is flying away from us at unprecedented speeds, so I doubt it'll be starting any apocalyptic wars...
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marsbug
post Sep 16 2008, 01:29 PM
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You never know...I've never trusted the things! ph34r.gif
Actually to get myself a bit less computer phobic i've been thinking of writing a fortran program to recreate the new horizons mission, basically calculating the trajectory and fuel requirments for earth to jupiter to pluto and beyond. Does anyone have any idea where I could go for some resources, or any suggestions on where to start?


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djellison
post Sep 16 2008, 01:55 PM
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Start with Orbiter ( www.orbitersim.com ) and its addons ( www.orbithangar.com ) smile.gif
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Greg Hullender
post Sep 16 2008, 02:27 PM
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QUOTE (marsbug @ Sep 16 2008, 06:29 AM) *
You never know...I've never trusted the things! ph34r.gif
Actually to get myself a bit less computer phobic i've been thinking of writing a fortran program to recreate the new horizons mission, basically calculating the trajectory and fuel requirments for earth to jupiter to pluto and beyond. Does anyone have any idea where I could go for some resources, or any suggestions on where to start?

You want to write one from scratch, or just use one that already exists?

If you're going to write it yourself, I'd really suggest you use something a bit more modern than Fortran, though. Java, if you're a Linux guy, or C#, if you have Windows might be nice. Or try Python (on either platform) for something even gentler.

--Greg
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ElkGroveDan
post Sep 16 2008, 07:08 PM
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QUOTE (Greg Hullender @ Sep 16 2008, 07:27 AM) *
I'd really suggest you use something a bit more modern than Fortran, though.


Agreed. All those stacks of cards can be difficult to handle.


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marsbug
post Sep 17 2008, 09:50 AM
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I was planning on using Fortran, mainly because its the only language i have any experience with and I already have a compiler, and starting from scratch. I haven't made any solid plans yet though. I'm still going through my old uni notes on things like transfer orbits. Does anyone know where I might look for some details on how launch windows for gravitational assists are calculated? My notes only skim over it briefly.


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peter59
post Oct 15 2008, 06:45 PM
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1,000 days and counting.
http://pluto.jhuapl.edu/overview/piPerspective.php
Alan Stern has right, itís hard to believe.


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John Flushing
post Oct 19 2008, 01:49 PM
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Upon reading the New Horizons Twitter page, I found a message that said, "Did you know? N.H. is carrying 9 items of memorabilia to Pluto and the Kuiper Belt. After flying 1000 days, the list will be released soon!"

Despite extensive internet searching I cannot find the list. Does anybody know (off the top of their head) if and when it will be released to the public?


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Alan Stern
post Oct 19 2008, 01:57 PM
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QUOTE (John Flushing @ Oct 19 2008, 02:49 PM) *
Upon reading the New Horizons Twitter page, I found a message that said, "Did you know? N.H. is carrying 9 items of memorabilia to Pluto and the Kuiper Belt. After flying 1000 days, the list will be released soon!"

Despite extensive internet searching I cannot find the list. Does anybody know (off the top of their head) if and when it will be released to the public?


Tuesday or so. Perhaps you want to start guessing what we sent....
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